health. abc's matt gutman starts us off with what's happening right now, matt? >> reporter: from a boat in the mobile bay, moments ago, we learned one of the passengers aboard the ship suffered a stroke and had to be medevacked. that's not the only danger here tonight. check out the tug boats, trying to nudge that 900-foot ship inside a quarter-mile channel. veering either way and it could ground. tonight they're doing that in the dark. >> reporter: tonight, with the lame colossus finally within sight of land, we get our first look inside -- the grim ship's log. >> been shipwrecked for three days. >> reporter: the hours long lines for food, after eight full days at sea -- five of them without power and sanitation. sewage seeping down walls, and this sandaled foot testing urine soaked carpets. the images showing shanty towns that sprang up on decks -- tent cities that carnival has denied existed. outside, the 900-foot long ship checkered with towels and bedding. some unfurling white banners. right there, above the lettering -- carnival triumph. those dressed for the tropics, huddl

takes us to a stretch of american highway that felt it the most. >> reporter: tangled and twisted on a detroit highway. this was the scene along a mile and a half stretch of i-75 today. at least 30 vehicles were involved in the crash. three people were killed, including two children believed to be siblings. the culprit? whiteout conditions from a single band of snow. wxyz meteorologist hallie vogel takes us through it. >> only 15 minutes. that's all it takes. >> reporter: this is what it looked like inside that blinding whiteout. it's called lake effect snow. and it was created as cold air and wind passed over the warmer waters of lake michigan. lake effect snow squalls are notorious. you can be driving along with perfect visibility, then, in seconds, you can't see anything at all. fierce winds whipped up snow along indiana highways today, too. 40 cars piled up on i-70. this is part of that same system that has created weather bedlam around the nation the past few days, including that tornado, believed to have had winds of 160 miles per hour in adairsville, georgia. abc's steve os

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